介词 by共有几种用法
问题描述：
介词 by共有几种用法
答
介词by的用法：
1.\x09表时间：We’ll have finished the work by ten o’clock.
2.\x09表交通方式：He came here by sea/ plane/bus.
3.\x09表方位：We often go out for a walk by the river.